Question: What is the bell tower with the highest vertical angle?
Paraphrase: What is the steepest stairway into a bell tower?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q200334 . ?ent wdt:P4183 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: Leaning Tower of Pisa, Caorle cathedral bell tower